标题: Observation of Structural Decomposition of Na3V2(PO4)(3) and Na3V2(PO4)(2)F-3 as Cathodes for Aqueous Zn-Ion Batteries
作者: Li, W (Li, Wei); Jing, XY (Jing, Xiaoyun); Jiang, K (Jiang, Kai); Wang, DH (Wang, Dihua)
来源出版物: ACS APPLIED ENERGY MATERIALS 卷: 4 期: 3 页: 2797-2807 DOI: 10.1021/acsaem.1c00067 出版年: MAR 22 2021
摘要: Na superionic conductor (NASICON)-type compounds have been recently considered to be some of the most attractive candidates for aqueous Zn-ion batteries (AZIBs) due to their large ionic channels and fast kinetics. However, in this work, our findings demonstrate that NASICON-type compounds are maybe not suitable for AZIBs due to their structural instability. Herein two typical NASICON structures, Na3V2(PO4)(3) and Na3V2(PO4)(2)F-3, as cathodes for AZIBs are investigated. Surprisingly, it is found that both cathodes undergo structural decomposition in 1 M Zn(CF3SO3)(2) electrolyte during repeated cycling. Na3V2(PO4)(3) degrades into Zn3V2O8, V2OS, and VO2 after 200 cycles, while Na3V2(PO4)(2)F-3 decomposes into dominant phases of V2O5, VPO5, and Zn-3(OH)(2)V2O7 center dot 2H(2)O, which are demonstrated by a combination of galvanostatic charge and discharge cycling, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) measurements. The possible decomposition mechanisms of both materials are not only associated with the inherent instability during Zn+ ion (de)intercalation but are also affected by the coinsertion of H+ and solvation effect of H2O, which accelerates the structural decomposition. This work presents insights on the structural evolution of NASICON-structured cathodes for AZIBs.
作者关键词: aqueous Zn-ion batteries; Na3V2(PO4)(3); Na3V2(PO4)(2)F-3; structural decomposition; degradation
地址: [Li, Wei; Jing, Xiaoyun; Wang, Dihua] Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.
[Jiang, Kai] Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Sch Elect & Elect Engn, Wuhan 430074, Peoples R China.
通讯作者地址: Wang, DH (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Wuhan 430072, Peoples R China.
Jiang, K (通讯作者)，Huazhong Univ Sci & Technol, State Key Lab Adv Electromagnet Engn & Technol, Sch Elect & Elect Engn, Wuhan 430074, Peoples R China.
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